He was found in a truck reported stolen in 2017, according to police. How it ended up in the Mississippi River isn’t exactly clear, but investigators believe it was resting in the murky water for a long time, saying it was “buried deep in the mud.”

Investigators determined the remains of a missing Illinois man were the remains of Daniel Claeys, according to the Associated Press. The investigation started 3 months ago when the remains were found inside a pickup truck submerged in the Mississippi River.